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| Number | Title | Issue Date |
| 7643540 | Pilot signals for synchronization and/or channel estimation The frame words of the embodiments are suitable for frame synchronization and/or channel estimation. By adding the autocorrelation and/or cross-correlation functions of frame words, double maximum values equal in magnitude and opposite polarity at zero and middle sh... | 01/05/2010 |
| 7639732 | Intelligent code tracking for spread spectrum systems A code-tracking system includes a loop filter, which receives an early/late error signal and outputs a loop filter error signal. An error scaling device receives the loop filter error representing an update and provides a code tracking adjustment signal. A controlle... | 12/29/2009 |
| 7639733 | Maximum likelihood estimation of time and frequency offset for OFDM systems A receiver in an OFDM system may include a joint maximum likelihood (ML) estimator that estimates both time offset and frequency offset. The estimator may use samples in an observation window to estimate the time offset and frequency offset. ... | 12/29/2009 |
| 7630428 | Fast digital carrier frequency error estimation algorithm using synchronization sequence Methods and apparatus for determining carrier frequency error of a serial offset quadrature pulse shaped signal, such as a minimum shift keyed (MSK) signal, are disclosed. Carrier frequency error is determined by receiving a quadrature pulse shaped signal having a s... | 12/08/2009 |
| 7616681 | Pilot signals for synchronization and/or channel estimation The frame words of the embodiments are suitable for frame synchronization and/or channel estimation. By adding the autocorrelation and/or cross-correlation functions of frame words, double maximum values equal in magnitude and opposite polarity at zero and middle sh... | 11/10/2009 |
| 7609755 | Simplified timing correction for data despreading of serial offset quadrature pulse-shaped spread signals A simplified timing correction method is provided for data despreading of serial offset quadrature pulse-shaped spread signals. The simplified timing correction algorithm is applied to a rake receiver for improved performance in a multi-path channel. Serial formatti... | 10/27/2009 |
| 7602841 | Pilot signals for synchronization and/or channel estimation The frame words of the embodiments are suitable for frame synchronization and/or channel estimation. By adding the autocorrelation and/or cross-correlation functions of frame words, double maximum values equal in magnitude and opposite polarity at zero and middle sh... | 10/13/2009 |
| 7602840 | Acquisition of a gated pilot Systems and techniques to acquire a gated pilot signal by searching for a first gated pilot signal, deriving timing information from the search for the first gated pilot signal, and searching for a second gated pilot signal using the timing information. This can be ... | 10/13/2009 |
| 7593453 | Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system A spread spectrum signal having an associated code is tracked at a receiver. A plurality of components of the spread spectrum signal are despread using the associated code. Each of the plurality of components has a different code phase than all others of the plurali... | 09/22/2009 |
| 7539237 | Fast locking mechanism for channelized ultrawide-band communications A receiver for acquisition and lock of an impulse radio signal comprising an adjustable time base to output a sliding periodic timing signal having an adjustable repetition rate, and a decode timing modulator to output a decode signal in response to the periodic tim... | 05/26/2009 |
| 7539238 | Extended algorithm data estimator A method of data estimation for a Time Division Duplex (TDD) Code Division Multiple Access (CDMA) system or any other system using an extended algorithm (EA) in preference to a truncated algorithm (TA). The EA avoids implementation errors by choice of proper extende... | 05/26/2009 |
| 7529291 | Methods and structures for rapid code acquisition in spread spectrum communications Methods and structure for improved speed in pseudo-noise code acquisition. A receiver may include features to evaluate multiple potential pseudo-noise (PN) digital code sequences in parallel to more rapidly acquire the PN code utilized by a corresponding transmitter... | 05/05/2009 |
| 7529292 | Code tracking loop with automatic power normalization The present invention is for a receiver incorporated into User Equipment (UE) or base stations of a code division multiple access (CDMA) communication system. The UE and base station are in communication with one of the plurality of base stations and receives a comm... | 05/05/2009 |
| 7526013 | Tag communications with access point A method of establishing communication at a tag includes calculating a metric for each of a plurality of automatic frequency control (AFC) hypotheses where the plurality of AFC hypotheses correspond to a timing used by an access point; based on the calculated metric... | 04/28/2009 |
| 7496132 | Pilot signals for synchronization and/or channel estimation The frame words of the embodiments are suitable for frame synchronization and/or channel estimation. By adding the autocorrelation and/or cross-correlation functions of frame words, double maximum values equal in magnitude and opposite polarity at zero and middle sh... | 02/24/2009 |
| 7480325 | Signal receiver for integrating and combining integrations in alternating time segments for signal acquisition at low signal strength A GPS receiver for integrating a GPS signal separately in a series of “A” type and “B” type time segments, the “A” segments alternating with the “B” time segments; combining the squares of the magnitudes of “A” time segment integrations correspon... | 01/20/2009 |
| 7466745 | Synchronizing PCM and pseudorandom clocks In a system having a received PN clock signal, a method is disclosed for providing a synchronized system clock signal having reduced jitter wherein the synchronized system clock signal is synchronized with the received PN clock signal. The method includes providing ... | 12/16/2008 |
| 7453926 | Bit synchronization detection methods and systems Methods and systems for detecting bit synchronization boundary in a received signal. A counter is set for defining a bit boundary of the received signal. Transitions in the received signal are detected and compared with the counter value as the transitions are expec... | 11/18/2008 |
| 7444144 | Initial cell search in wireless communication systems A method and system for performing initial cell search is disclosed. Step 1 processing is preformed to detect a peak primary synchronization code (PSC) location (i.e. chip offset or chip location). Step 2 processing is performed to obtain the toffset and ... | 10/28/2008 |
| 7433391 | Spread-spectrum receiver with fast M-sequence transform A receiving system dynamically searches a communications band for transmissions of messages having the same nominal communications parameters, including the use of the same spreading code, but having potentially different specific frequencies and code-phases. The re... | 10/07/2008 |
| 7428278 | Method and apparatus for parallel midamble cancellation Method and apparatus for performing midamble cancellation to remove midamble interference from the convolution tail of data field 1 and the first W-1 chips of the midamble field which results from the delay spread of the multipath channel and for canceling the first... | 09/23/2008 |
| 7421013 | Maximum likelihood estimation of time and frequency offset for OFDM systems A receiver in an OFDM system may include a joint maximum likelihood (ML) estimator that estimates both time offset and frequency offset. The estimator may use samples in an observation window to estimate the time offset and frequency offset. ... | 09/02/2008 |
| 7415354 | System and method for GPS acquisition using advanced tight coupling A system and method for GPS acquisition in relatively high interference is described. Acquisition is aided by an Advanced Tightly Coupled (ATC) tracking filters that compute a satellite range residuals and range rate residuals for satellites being acquired. Multiple... | 08/19/2008 |
| 7412014 | Timing-adjusting method and apparatus, and diversity receiving method and apparatus An A-D conversion unit performs analog-to-digital conversions on baseband signals. A correlation processing unit carries out a correlation processing. A power computing unit computes the power of correlation values. An inter-signal condition determining unit compare... | 08/12/2008 |
| 7412013 | Start-up automatic frequency control (AFC) method and apparatus A method and apparatus for use in connection with wireless communication to adjust the frequency of an oscillator to synchronize with a received signal by correlating a synchronization code channel with training sequences to estimate positive and negative offsets wh... | 08/12/2008 |
| 7406113 | Integrated circuit for code acquisition A semiconductor integrated circuit for processing a plurality of received broadcast signals, such as GPS signals, is operable in two modes: acquisition and tracking. In an acquisition mode, sample reducer combines samples of a received signal for correlation with a ... | 07/29/2008 |
| 7406144 | Clock generator circuit using phase modulation technology and method thereof A clock generator circuit, comprising: a multi-phase clock signal generator for generating a plurality of clock signals having a same frequency but difference phases according to a reference clock signal; a modulation device for generating a phase modulation signal ... | 07/29/2008 |
| 7403555 | Acquisition circuit for low chip rate option for mobile telecommunication system A User Equipment (UE) has a circuit that performs the acquisition for the low chip rate option of the Universal Mobile Telecommunication System (UMTS) Time Division Duplex (TDD) standard as formulated by the Third Generation Partnership Project (3GPP). The present i... | 07/22/2008 |
| 7403558 | Integrated circuit for code acquisition A semiconductor integrated circuit for processing a plurality of received broadcast signals, such as GPS signals, is operable in two modes: acquisition and tracking. In an acquisition mode, a memory arrangement comprising two circulating shift registers circulates s... | 07/22/2008 |
| 7400654 | Method for synchronizing a receiver with a transmitter A method is provided for synchronizing a receiver with a transmitter, wherein a first synchronization signal with a multiplicity of second synchronization signals is transmitted from the transmitter to the receiver, a set of second synchronization signals is subdivi... | 07/15/2008 |
| 7398287 | Fast linear feedback shift register engine A method of generating a pseudo-noise sequence without masking a linear feedback shift register (LFSR) generator is provided. An offset pseudo-noise sequence is generated at a desired offset from a reference psuedo-noise sequence by determining a corresponding initi... | 07/08/2008 |
| 7388899 | Spreading code structure for ultra wide band communications The ultra wide band communication system of the present invention includes a transmitter (station) and a receiver (station). The transmitter and the receiver employ spreading code comprised of code groups, which respectively comprise varied, auto-correlated codes. C... | 06/17/2008 |
| 7386035 | Method of compensating for energy loss and eliminating inter-symbol interference and inter-chip interference and rake receiver for WLAN adopting the same Provided is a method of compensating for energy loss and eliminating inter-symbol interference (ISI) and inter-chip interference (ISI) in wireless signals, and a rake receiver for wireless LANs adopting the same. The rake receiver compensates for energy loss of a CC... | 06/10/2008 |
| 7382822 | Code acquisition device and method using two-step search process in DS-CDMA UWB modem There is provided a code acquisition device and method using a two-step search process in a DS-CDMA UWB modem. The device includes: an I/Q channel symbol generating unit for, generating a plurality (i) of nth I/Q channel symbols in a first search process ... | 06/03/2008 |
| 7379748 | Method for speeding up synchronization by having a search frequency list comprising a limited number of search frequencies A method for initial synchronization in a mobile telecommunications network to connect a mobile terminal (10) to a base station (12). The mobile terminal has a search frequency list comprising a limited number of search frequencies. The method comprise... | 05/27/2008 |
| 7372888 | Method and apparatus for software reconfigurable communication transmission/reception and navigation signal reception The method and device performs spread spectrum based communication and/or navigation. Device embodiments may include a receiver having a plurality of programmable tracking units and a processor in communication with the receiver to control the device, such as reconf... | 05/13/2008 |
| 7372896 | Iterative detection and decoding for a MIMO-OFDM system Techniques to iteratively detect and decode data transmitted in a wireless (e.g., MIMO-OFDM) communication system. The iterative detection and decoding is performed by iteratively passing soft (multi-bit) “a priori” information between a detector and a decoder. ... | 05/13/2008 |
| 7372892 | Simple and robust digital code tracking loop for wireless communication systems A simple and robust CTL is used for time tracking of multipath components of a spread spectrum signal transmitted over a wireless multipath fading channel. A digital code-tracking loop includes the implementations of despreading early and late data samples by use of... | 05/13/2008 |
| 7369577 | Code group acquisition procedure for a UMTS-FDD receiver Step 2 demodulation is conventionally performed using a secondary synchronization channel that correlates a received signal at a known time slot location against each of a plurality of sequences associated with the secondary synchronization code. The disclosed imple... | 05/06/2008 |
| 7369534 | Reducing search time using known scrambling code offsets Techniques for reducing search time using known scrambling code offsets are disclosed. In one embodiment, a plurality of search results is generated by correlating a received signal with a synchronization sequence. The plurality of search results is reduced by remov... | 05/06/2008 |